I don't know if you should be worrying much about the change in accuracy of the Google KWTool, in my opinion/experience that tool was not very accurate anyways.
Best posts made by QPLF
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RE: Google update going to cause problems for me and maybe you!
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RE: Does anyone do SEO for a % of sales?
I once had an SEO "expert" offer me the following deal:
For a small advance fee, she would work on optimizing my site for certain keywords, and she would ONLY be payed when those keywords were on the top 10 SERP for Google (Google.fr), there was a one year minimum engagement and i believe that she was asking for 120 Euros (about 162 dollars US) per keyword per month in the top 10.
Maybe you can work something out like this with the people who will work on your site's SEO.
Keep in mind what EGOL says: there is a lot of upfront work in an SEO project so you will probably be unable to escape the upfront fee.
Whatever you do, choose your keywords carefully, traffic does not equal conversions/sales, take this into consideration when negatiating the terms of your agreement with whoever does your SEO.